Improvement in machines for drilling rocks



T. GROSSETT.

ROCK DRILL.

No.32,963. Patented July so, 1861.

UNITED STATES PATENT OFFICE.

TRUMAN CROSSETT, OF NORTH SAN JUAN, CALIFORNIA.

lM PROVEMEN T IN IlIIACHINES FOR DRILLING ROCKS.

Specification forming part of Letters Patent No. 32,963, dated July 30, 1861.

To all whom it may concern:

Be it known that L'TRUMAN Onossnrr, of North San J uan, in the county of Nevada and State of California, have inventeda new and Improved Machine for Drilling Rocks in Tunnels, Quarries, Ditches, &c.; and-I do hereby r declare that thefollowing is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure 1 is a side view of my invention; Fig. 2, a section of the same, taken in the line 00 m, Fig. 1'; Fig. 3, a section of a portion of the same, taken in the line y 3 Fig. 1.

Similar lettersof reference indicate corresponding parts in the several figures. The object of this invention-is to obtain a simple and eflicient rock-drill that may be 'used in all cases where machine-drills can be applied'and be capable of being operated manually or by other power.

. The invention consists in placing an adj ustablc hammer-shaft within a swinging or adjustable frame and giving the drill, which is also fitted in said adjustable frame, a rotating movement from the hammer-shaft, all the parts being arranged, substantially as hei'teinafter described, to effect the desired resu Toenable those skilled in the artto fully understand and construct my invention, I willproceed to describe it. p

A represents a platform or base, to each side of, which an upright 13 is secured. These uprights B are slotted nearly their whole length, as shown{at a, and between the uprights a swingingor adjustable frame 0 is placed, said frame being formed of two bars I) b, the front ends of which are attached at right angles to a bar 0. The back ends of bars I) b are connected by a cross-bar.

The frame 0 is supended or hung between the uprights B B. by-pins (1 cl, which pass through plates e e and into the bars Z) I), the

plates e 6 serving as clamps to hold the frame 0 at any desired height. In the back part of the frame 0 there is secured, by a pivot or fulcrum pin 6', a bar D, which is allowed to work freely on pin c-. This bar Dhas a semicircular bar E secured to each side of it. These bars are perforated with holes f, as shown clearly in Fig. 1.

F is a hammer-shaft, the back end of which is secured by pin 6 in bar D at about its center. The hammer-shaftFis secured betweei the bars E by a pin 9. The hammer F may be of any desired weight.

To the bar 0, at the front end of frame 0, there are two bars h 71 attached, between which a collar i is placed and allowed to retate freely. This collar '21 is grasped by a clamp II, which, is formed of two jaws j k, connected by a pivot Z. (See Fig. 3.) One jaw j is connected by a chain or cord m to a spring I, which is secured to the bar 0, and the other j k is connectedby a chain or cord 9?. with a bent lever J, which is secured in the frame G, and has its back end projecting over hammer-shaft F.

K represents the drill, which passes through the collar 1'- and is allowed to slide loosely therein. The drill may be connected with the collar by a feather and groove.

The platform or base A may be fitted on any suitable frame or base and arranged in any proper way to admit of being turned and adjusted in any desired position, as the work may require. The frame 0 also, it will be seen, may be adjusted at any required angle,

so that the drill K may be in a proper relative position with the work. The barD may be operated manuallyor by any other convenient power, and each time the hammer descends it acts upon the drill, forcing the same info the rock. Each time the hammer is raised the shaftF actuates lever J, and the jaw 70 of clamp I[ and also the jaw j will be made to grasp the collar t, and the latter par.- tially turned, so that each time the hammer strikes the drill its bit or cutting end will act in a fresh spot. The jaws j k relax as the hammer descends under the action of spring I. The hammer-shaft F may be set in any proper relative position with bar E, so that the different degrees of adjustment of frame 0 will not interfere with a proper working position of bar E.

From the above description it will be seen that a very simple rock-drill is obtained, and one that may be operated with the greatest facility and readily applied to its work.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, i.s--

1. The swinging or adjust-able frame 0, susing the' shaft F at any suitable angle with bar pended between the uprights B B, and hav- D by means of the pin g and semicircular ing the hammer-shaft F and bar D fitted in bars E E, as and for the purpose specfied.

it and arranged with the clamp H and drill K, TRUMAN CROSSETT. to operate as and for the purpose set forth. Witnesses:

2. The connecting of the hammer-shaft F RICHARD ABBEY,

to the bar D by a pivot or pin e, and secur- WILL IAM D. HILL. 

